Effects of Degraded Agent and Munitions Anomalies on Chemical Stockpile Disposal Operations (2004) / Chapter Skim
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3. Tracking and Analysis of Stockpile Leakers
3. Tracking and Analysis of Stockpile Leakers
Pages 19-35
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From page 19... ...
19 occurrence and measurement of leaking munitions in the chemical stockpile. The committee primarily considered the database provided by SBCCOM but also referred to the Defense Ammunition Center data as needed.
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As discussed below, the committee primarily used data developed during Period III, although some analyses were performed using data from Periods I and II to help provide a historical context. The committee performed various analyses that encompassed all types of munitions, even as it recognized that the Army has placed appropriate emphasis on monitoring and inspecting GB M55 rockets for leakers in recent years (U.S.
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. Specific guidance states that each item is to be visually inspected for evidence of leakage, condition 21 TABLE 3-1 SMI Requirements for Toxic Chemical Items Item Not Overpacked Overpacked Ton containers Mines Projectiles/cartridges Bombs Spray tanks DOT bottles Rockets SUPLECAM samples M56 warheads Binary components Quarterly Annual Annual Annual Quarterly Quarterly Quarterly N/A Quarterly N/A Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly Quarterly N/A Source: U.S.
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Figure 3-1 depicts leaker data gathered from monitoring during Periods I, II, and III (see also Table 3-2~. The data for overpacks and rockets are presented by year; they include leaking munitions from all sites.
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. 23 I 1 1 1 1 1 1 T I I I 1 T 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 200 · Overpack ~ All Others Rockets Distribution of leaking munitions in the Anniston stockpile from 1973 to June 30, 2002.
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Period I, 1973-1984; Period II, 1984-1991; Period III, 1992 forward. TABLE 3-3 Munition Leakers by Type of Agent Agent GB H VX HD HT Stockpile quantity 1,546,387 77,498 497,175 931,945 270,135 Number of leakers 3,859 360 273 236 61 Percent leakers 0.25 0.46 0.05 0.03 0.02 Source: Studdert (2002~.
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. The frequency of leaking munitions containing GB is a function of subtype.
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Technical data in leaker reports are used as a management tool to minimize risk associated with the storage of the chemical stockpile (Studdert, 2002~. They do this by · Identifying leakage trends among specific munitions families, manufacturers' lots, and agent populations; Establishing or modifying the scope and frequency of surveillance inspections and special studies; Prioritizing resources to maximize benefits (e.g., installation of engineering controls on selected magazines or during specific operations)
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STATISTICAL APPROACH OF THE STOCKPILE COMMITTEE Approximately 3,300,000 munitions were in the original stockpile prior to destruction operations at JACADS and TOCDF. From the monitoring protocols used by the Army from 1973 to June 2002 to inspect the stockpile, 4,789 leakers were reported in the four categories described in the preceding section (see Item 9 in Box 3-1 and Table 3-2)
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From page 28... ...
For the Pareto charts, data from all three periods were used in order to gain perspective on the distribution of leaker types over the entire time the stockpile was monitored. Because the Pareto charts encompass the total number of leakers found during the entire 30-year period and are not dependent on the year a leaker was discovered, they are probably reasonable representations of the distribution of total leakers at Anniston.
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From page 29... ...
enables easy visualization of the data on leakers. Figure 3-5 is a Pareto chart showing the number of Category 1 leaks by agent type across all sites and all munition types for all the years covered by the STS database (Periods I, II, and III)
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4,000 ~D 3,0000 2,000Z 1,000O- 100 - 80 - 60 - 40 - 20 - O AGE EGG ~~ S\ ALGA ALGA 0~ Cou nt 2,271 984 364 201 195 89 136 Percent 53.6 23.2 8.6 4.7 4.6 2.1 3.2 Cumulative (°/0) 53.6 76.8 85.4 90.1 94.7 96.8 100.0 FIGURE 3-7 Pareto chart of Category 1 leaks by site for all sites.
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Tables 3-5, 3-6, and 3-7 offer site-centric perspectives of leaker occurrences according to year, DODIC, and agent type, respectively. Leaker occurrences could be related to the ages of the leaker muni
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Table 3-8 presents recorded leakers during Period III by agent type across all sites. The contribution from the ANCA stockpile to the population of leaking munitions for Period III is shown in Table 3-9.
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69.6 88.2 99.6 100.0 33 - 100 - 80 - 60 ~ c' - 40 - 20 - O FIGURE 3-9 GB rocket leaks by agent subtype at ANCA from 1992 through July 2002.
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If, in fact, it is still to be reached, the stability of the stored munitions could be significantly compromised and leakage rates could rise substantially. Statistical treatment of the information in the STS database by available software tools such as Minitab can be used to examine a very large number of possible interactions and to develop findings that could provide qualitative guidance for monitoring the existing stockpile until its destruction is complete.
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From page 35... ...
Army Technical Center for Explosives Safety of the Defense Ammunition Center have maintained separate databases on the occurrence of leakers in the chemical stockpile. The committee examined both but used the SBCCOM database for this study, adding several new data fields in the process (such as age of munitions and type of agent)
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